/** @file
Parser: commonly functions.
Copyright(c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/
static const char* IDENT_COMMON_C="$Date: 2003/11/20 15:35:31 $";
#include "pa_common.h"
#include "pa_exception.h"
#include "pa_hash.h"
#include "pa_globals.h"
#include "pa_request_charsets.h"
#include "pa_charsets.h"
#define PA_HTTP
#ifdef PA_HTTP
#include "pa_vstring.h"
#include "pa_vint.h"
#include "pa_vhash.h"
#include "pa_vtable.h"
#ifdef CYGWIN
#define _GNU_H_WINDOWS32_SOCKETS
// for PASCAL
#include <windows.h>
// SOCKET
typedef u_int SOCKET;
int PASCAL closesocket(SOCKET);
#else
# if defined(WIN32)
# include <windows.h>
# else
# define closesocket close
# endif
#endif
#else
# if defined(WIN32)
# include <windows.h>
# endif
#endif
// some maybe-undefined constants
#ifndef _O_TEXT
# define _O_TEXT 0
#endif
#ifndef _O_BINARY
# define _O_BINARY 0
#endif
#ifdef HAVE_FTRUNCATE
# define PA_O_TRUNC 0
#else
# ifdef _O_TRUNC
# define PA_O_TRUNC _O_TRUNC
# else
# error you must have either ftruncate function or _O_TRUNC bit declared
# endif
#endif
// defines for globals
#define FILE_STATUS_NAME "status"
// globals
const String file_status_name(FILE_STATUS_NAME);
// defines for statics
#define HTTP_METHOD_NAME "method"
#define HTTP_TIMEOUT_NAME "timeout"
#define HTTP_HEADERS_NAME "headers"
#define HTTP_ANY_STATUS_NAME "any-status"
#define HTTP_CHARSET_NAME "charset"
#define HTTP_TABLES_NAME "tables"
// statics
static const String http_method_name(HTTP_METHOD_NAME);
static const String http_timeout_name(HTTP_TIMEOUT_NAME);
static const String http_headers_name(HTTP_HEADERS_NAME);
static const String http_any_status_name(HTTP_ANY_STATUS_NAME);
static const String http_charset_name(HTTP_CHARSET_NAME);
static const String http_tables_name(HTTP_TABLES_NAME);
// defines
#define DEFAULT_USER_AGENT "parser3"
// functions
void fix_line_breaks(char *str, size_t& length) {
//_asm int 3;
const char* const eob=str+length;
char* dest=str;
// fix DOS: \r\n -> \n
// fix Macintosh: \r -> \n
char* bol=str;
while(char* eol=(char*)memchr(bol, '\r', eob -bol)) {
size_t len=eol-bol;
if(dest!=bol)
memcpy(dest, bol, len);
dest+=len;
*dest++='\n';
if(&eol[1]<eob && eol[1]=='\n') { // \r, \n = DOS
bol=eol+2;
length--;
} else // \r, not \n = Macintosh
bol=eol+1;
}
// last piece without \r
if(dest!=bol)
memcpy(dest, bol, eob-bol);
str[length]=0; // terminating
}
char* file_read_text(Request_charsets& charsets,
const String& file_spec,
bool fail_on_read_problem,
HashStringValue* params/*, HashStringValue* * out_fields*/) {
File_read_result file=
file_read(charsets, file_spec, true, params, fail_on_read_problem);
return file.success?file.str:0;
}
#ifdef PA_HTTP
//http request stuff
#undef CRLF
#define CRLF "\r\n"
static bool set_addr(struct sockaddr_in *addr, const char* host, const short port){
memset(addr, 0, sizeof(*addr));
addr->sin_family=AF_INET;
addr->sin_port=htons(port);
if(host) {
if(struct hostent *hostIP=gethostbyname(host))
memcpy(&addr->sin_addr, hostIP->h_addr, hostIP->h_length);
else
return false;
} else
addr->sin_addr.s_addr=INADDR_ANY;
return true;
}
static int http_read_response(String& response, int sock, bool fail_on_status_ne_200){
int result=0;
size_t EOLat=0;
while(true) {
char *buf=new(PointerFreeGC) char[MAX_STRING];
ssize_t size=recv(sock, buf, MAX_STRING, 0);
if(size<=0)
break;
response.append_strdup(buf, size, String::L_TAINTED);
if(!result && (EOLat=response.pos(CRLF, 2))!=STRING_NOT_FOUND) { // checking status in first response
const String& status_line=response.mid(0, (size_t)EOLat);
ArrayString astatus;
size_t pos_after=0;
status_line.split(astatus, pos_after, " ");
const String& status_code=*astatus.get(1);
result=status_code.as_int();
if(fail_on_status_ne_200 && result!=200)
throw Exception("http.status",
&status_code,
"invalid HTTP response status");
}
}
if(result)
return result;
else
throw Exception("http.response",
0,
"bad response from host - no status found (size=%lu)", response.length());
}
/* ********************** request *************************** */
#if defined(SIGALRM) && defined(HAVE_SIGSETJMP) && defined(HAVE_SIGLONGJMP)
# define PA_USE_ALARM
#endif
#ifdef PA_USE_ALARM
static sigjmp_buf timeout_env;
static void timeout_handler(int sig){
siglongjmp(timeout_env, 1);
}
#endif
static int http_request(String& response,
const char* host, int port,
const char* request,
int
#ifdef PA_USE_ALARM
timeout
#endif
,
bool fail_on_status_ne_200) {
if(!host)
throw Exception("http.host",
0,
"zero hostname"); //never
#ifdef PA_USE_ALARM
signal(SIGALRM, timeout_handler);
#endif
int sock=-1;
#ifdef PA_USE_ALARM
if(sigsetjmp(timeout_env, 1)) {
// stupid gcc [2.95.4] generated bad code
// which failed to handle sigsetjmp+throw: crashed inside of pre-throw code.
// rewritten simplier [though duplicating closesocket code]
if(sock>=0)
closesocket(sock);
throw Exception("http.timeout",
origin_string,
"timeout occured while retrieving document");
return 0; // never
} else {
alarm(timeout);
#endif
try {
int result;
struct sockaddr_in dest;
if(!set_addr(&dest, host, port))
throw Exception("http.host",
0,
"can not resolve hostname \"%s\"", host);
if((sock=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP/*0*/))<0)
throw Exception("http.connect",
0,
"can not make socket: %s (%d)", strerror(errno), errno);
if(connect(sock, (struct sockaddr *)&dest, sizeof(dest)))
throw Exception("http.connect",
0,
"can not connect to host \"%s\": %s (%d)", host, strerror(errno), errno);
size_t request_size=strlen(request);
if(send(sock, request, request_size, 0)!=(ssize_t)request_size)
throw Exception("http.connect",
0,
"error sending request: %s (%d)", strerror(errno), errno);
result=http_read_response(response, sock, fail_on_status_ne_200);
closesocket(sock);
#ifdef PA_USE_ALARM
alarm(0);
#endif
return result;
} catch(...) {
#ifdef PA_USE_ALARM
alarm(0);
#endif
if(sock>=0)
closesocket(sock);
rethrow;
}
#ifdef PA_USE_ALARM
}
#endif
}
#ifndef DOXYGEN
struct Http_pass_header_info {
Request_charsets* charsets;
String* request;
bool user_agent_specified;
};
#endif
static void http_pass_header(HashStringValue::key_type key,
HashStringValue::value_type value,
Http_pass_header_info *info) {
*info->request <<key<<": "
<< attributed_meaning_to_string(*value, String::L_HTTP_HEADER, false)
<< CRLF;
if(String(key, String::L_TAINTED).change_case(info->charsets->source(), String::CC_UPPER)=="USER-AGENT")
info->user_agent_specified=true;
}
static Charset* detect_charset(Charset& source_charset, const String& content_type_value) {
const String::Body CONTENT_TYPE_VALUE=
content_type_value.change_case(source_charset, String::CC_UPPER);
// content-type: xxx/xxx; source_charset=WE-NEED-THIS
// content-type: xxx/xxx; source_charset="WE-NEED-THIS"
// content-type: xxx/xxx; source_charset="WE-NEED-THIS";
size_t before_charseteq_pos=CONTENT_TYPE_VALUE.pos("CHARSET=");
if(before_charseteq_pos!=STRING_NOT_FOUND) {
size_t charset_begin=before_charseteq_pos+8/*CHARSET="*/;
size_t open_quote_pos=CONTENT_TYPE_VALUE.pos('"', charset_begin);
bool quoted=open_quote_pos==charset_begin;
if(quoted)
charset_begin++; // skip opening '"'
size_t charset_end=CONTENT_TYPE_VALUE.length();
if(quoted) {
size_t close_quote_pos=CONTENT_TYPE_VALUE.pos('"', charset_begin);
if(close_quote_pos!=STRING_NOT_FOUND)
charset_end=close_quote_pos;
} else {
size_t delim_pos=CONTENT_TYPE_VALUE.pos(';', charset_begin);
if(delim_pos!=STRING_NOT_FOUND)
charset_end=delim_pos;
}
const String::Body CHARSET_NAME_BODY=
CONTENT_TYPE_VALUE.mid(charset_begin, charset_end);
return &charsets.get(CHARSET_NAME_BODY);
}
return 0;
}
#ifndef DOXYGEN
struct File_read_http_result {
char *str; size_t length;
HashStringValue* headers;
};
#endif
/// @todo build .cookies field. use ^file.tables.SET-COOKIES.menu{ for now
static File_read_http_result file_read_http(Request_charsets& charsets,
const String& file_spec,
HashStringValue *options=0) {
File_read_http_result result;
char host[MAX_STRING];
const char* uri;
int port;
const char* method=0;
int timeout=2;
bool fail_on_status_ne_200=true;
Value* vheaders=0;
Charset *asked_remote_charset=0;
if(options) {
int valid_options=0;
if(Value* vmethod=options->get(http_method_name)) {
valid_options++;
method=vmethod->as_string().cstr();
}
if(Value* vtimeout=options->get(http_timeout_name)) {
valid_options++;
timeout=vtimeout->as_int();
}
if(vheaders=options->get(http_headers_name)) {
valid_options++;
}
if(Value* vany_status=options->get(http_any_status_name)) {
valid_options++;
fail_on_status_ne_200=!vany_status->as_bool();
}
if(Value* vcharset_name=options->get(http_charset_name)) {
valid_options++;
asked_remote_charset=&::charsets.get(vcharset_name->as_string().
change_case(charsets.source(), String::CC_UPPER));
}
if(valid_options!=options->count())
throw Exception("parser.runtime",
0,
"invalid option passed");
}
if(!asked_remote_charset) // defaulting to $request:charset
asked_remote_charset=&charsets.source();
//preparing request
String& connect_string=*new String;
// not in ^sql{... L_SQL ...} spirit, but closer to ^file::load one
connect_string.append(file_spec, String::L_URI); // tainted pieces -> URI pieces
const char* request_cstr;
{
// influence URLencoding of tainted pieces to String::L_URI lang
Temp_client_charset temp(charsets, *asked_remote_charset);
const char* connect_string_cstr=connect_string.cstr(String::L_UNSPECIFIED);
const char* current=connect_string_cstr;
if(strncmp(current, "http://", 7)!=0)
throw Exception(0,
&connect_string,
"does not start with http://"); //never
current+=7;
strncpy(host, current, sizeof(host)-1); host[sizeof(host)-1]=0;
char* host_uri=lsplit(host, '/');
uri=host_uri?current+(host_uri-1-host):"/";
char* port_cstr=lsplit(host, ':');
char* error_pos=0;
port=port_cstr?strtol(port_cstr, &error_pos, 0):80;
//making request
String request;
if(method)
request<<method;
else
request<<"GET";
request<< " "<< uri <<" HTTP/1.0" CRLF
"host: "<< host << CRLF;
bool user_agent_specified=false;
if(vheaders && !vheaders->is_string()) { // allow empty
if(HashStringValue *headers=vheaders->get_hash()) {
Http_pass_header_info info={&charsets, &request};
headers->for_each(http_pass_header, &info);
user_agent_specified=info.user_agent_specified;
} else
throw Exception("parser.runtime",
&connect_string,
"headers param must be hash");
};
if(!user_agent_specified) // defaulting
request << "user-agent: " DEFAULT_USER_AGENT CRLF;
request << CRLF;
request_cstr=request.cstr(String::L_UNSPECIFIED);
}
// recode those pieces which are not in String::L_URI lang
// [those violating HTTP standard, but widly used]
request_cstr=Charset::transcode(
String::C(request_cstr, strlen(request_cstr)),
charsets.source(),
*asked_remote_charset);
//sending request
String response;
int status_code=http_request(response,
host, port, request_cstr,
timeout, fail_on_status_ne_200);
//processing results
size_t pos=response.pos(CRLF CRLF, 4);
if(pos==STRING_NOT_FOUND || pos<1) {
throw Exception("http.response",
&connect_string,
"bad response from host - no headers found");
}
const String& header_block=response.mid(0, pos);
const String& raw_body=response.mid(pos+4, response.length());
ArrayString aheaders;
result.headers=new HashStringValue;
VHash* vtables=new VHash;
result.headers->put(http_tables_name, vtables);
HashStringValue& tables=vtables->hash();
size_t pos_after=0;
header_block.split(aheaders, pos_after, CRLF);
//processing headers
size_t aheaders_count=aheaders.count();
Charset* real_remote_charset=0; // undetected, yet
for(size_t i=1; i<aheaders_count; i++) {
const String& line=*aheaders.get(i);
pos=line.pos(": ", 2);
if(pos==STRING_NOT_FOUND || pos<1)
throw Exception("http.response",
&connect_string,
"bad response from host - bad header \"%s\"", line.cstr());
const String::Body HEADER_NAME=
line.mid(0, pos).change_case(charsets.source(), String::CC_UPPER);
const String& header_value=line.mid(pos+2, line.length());
if(HEADER_NAME=="CONTENT-TYPE")
real_remote_charset=detect_charset(charsets.source(), header_value);
// tables
{
Value *valready=(Value *)tables.get(HEADER_NAME);
bool existed=valready!=0;
Table *table;
if(existed) {
// second+ appearence
table=valready->get_table();
} else {
// first appearence
Table::columns_type columns =new ArrayString(1);
*columns+=new String("value");
table=new Table(columns);
}
// this string becomes next row
ArrayString& row=*new ArrayString(1);
row+=&header_value;
*table+=&row;
// not existed before? add it
if(!existed)
tables.put(HEADER_NAME, new VTable(table));
}
result.headers->put(HEADER_NAME, new VString(header_value));
}
// defaulting to used-asked charset [it's never empty!]
if(!real_remote_charset)
real_remote_charset=asked_remote_charset;
// todo: do that only if ^file::load[text
// output response
String::C real_body=Charset::transcode(
String::C(raw_body.cstrm()/*must be modifiable*/, raw_body.length()),
*real_remote_charset,
charsets.source());
result.str=const_cast<char *>(real_body.str); // hacking a little
result.length=real_body.length;
result.headers->put(file_status_name, new VInt(status_code));
return result;
}
#endif
#ifndef DOXYGEN
struct File_read_action_info {
char **data; size_t *data_size;
};
#endif
static void file_read_action(
struct stat& finfo,
int f,
const String& file_spec, const char* /*fname*/, bool as_text,
void *context) {
File_read_action_info& info=*static_cast<File_read_action_info *>(context);
if(size_t to_read_size=(size_t)finfo.st_size) {
*info.data=new(PointerFreeGC) char[to_read_size+(as_text?1:0)];
*info.data_size=(size_t)read(f, *info.data, to_read_size);
if(ssize_t(*info.data_size)<0 || *info.data_size>to_read_size)
throw Exception(0,
&file_spec,
"read failed: actually read %l bytes count not in [0..%lu] valid range",
*info.data_size, to_read_size);
} else { // empty file
if(as_text) {
*info.data=new(PointerFreeGC) char[1];
*(char*)(*info.data)=0;
} else
*info.data=0;
*info.data_size=0;
return;
}
}
File_read_result file_read(Request_charsets& charsets, const String& file_spec,
bool as_text, HashStringValue *params,
bool fail_on_read_problem) {
File_read_result result={false};
#ifdef PA_HTTP
if(file_spec.starts_with("http://")) {
// fail on read problem
File_read_http_result http=file_read_http(charsets, file_spec, params);
result.success=true;
result.str=http.str;
result.length=http.length;
result.headers=http.headers;
} else {
#endif
if(params && params->count())
throw Exception("parser.runtime",
0,
"invalid option passed");
File_read_action_info info={&result.str, &result.length};
result.success=file_read_action_under_lock(file_spec,
"read", file_read_action, &info,
as_text, fail_on_read_problem);
#ifdef PA_HTTP
}
#endif
if(result.success && as_text) {
// UTF-8 signature: EF BB BF
if(result.length>=3) {
char *in=(char *)result.str;
if(strncmp(in, "\xEF\xBB\xBF", 3)==0) {
result.str=in+3; result.length-=3;// skip prefix
}
}
fix_line_breaks((char *)(result.str), result.length);
// note: after fixing
((char*&)(result.str))[result.length]=0;
}
return result;
}
#ifdef PA_SAFE_MODE
void check_safe_mode(struct stat finfo, const String& file_spec, const char* fname) {
if(finfo.st_uid/*foreign?*/!=geteuid()
&& finfo.st_gid/*foreign?*/!=getegid())
throw Exception("parser.runtime",
&file_spec,
"parser is in safe mode: "
"reading files of foreign group and user disabled "
"[recompile parser with --disable-safe-mode configure option], "
"actual filename '%s', "
"fuid(%d)!=euid(%d) or fgid(%d)!=egid(%d)",
fname,
finfo.st_uid, geteuid(),
finfo.st_gid, getegid());
}
#endif
bool file_read_action_under_lock(const String& file_spec,
const char* action_name, File_read_action action, void *context,
bool as_text,
bool fail_on_read_problem) {
const char* fname=file_spec.cstr(String::L_FILE_SPEC);
int f;
// first open, next stat:
// directory update of NTFS hard links performed on open.
// ex:
// a.html:^test[] and b.html hardlink to a.html
// user inserts ! before ^test in a.html
// directory entry of b.html in NTFS not updated at once,
// they delay update till open, so we would receive "!^test[" string
// if would do stat, next open.
// later: it seems, even this does not help sometimes
if((f=open(fname, O_RDONLY|(as_text?_O_TEXT:_O_BINARY)))>=0) {
try {
if(pa_lock_shared_blocking(f)!=0)
throw Exception("file.lock",
&file_spec,
"shared lock failed: %s (%d), actual filename '%s'",
strerror(errno), errno, fname);
struct stat finfo;
if(stat(fname, &finfo)!=0)
throw Exception("file.missing", // hardly possible: we just opened it OK
&file_spec,
"stat failed: %s (%d), actual filename '%s'",
strerror(errno), errno, fname);
#ifdef PA_SAFE_MODE
check_safe_mode(finfo, file_spec, fname);
#endif
action(finfo, f, file_spec, fname, as_text, context);
} catch(...) {
pa_unlock(f);close(f);
if(fail_on_read_problem)
rethrow;
return false;
}
pa_unlock(f);close(f);
return true;
} else {
if(fail_on_read_problem)
throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
&file_spec,
"%s failed: %s (%d), actual filename '%s'",
action_name, strerror(errno), errno, fname);
return false;
}
}
static void create_dir_for_file(const String& file_spec) {
size_t pos_after=1;
size_t pos_before;
while((pos_before=file_spec.pos('/', pos_after))!=STRING_NOT_FOUND) {
mkdir(file_spec.mid(0, pos_before).cstr(String::L_FILE_SPEC), 0775);
pos_after=pos_before+1;
}
}
bool file_write_action_under_lock(
const String& file_spec,
const char* action_name, File_write_action action, void *context,
bool as_text,
bool do_append,
bool do_block,
bool fail_on_lock_problem) {
const char* fname=file_spec.cstr(String::L_FILE_SPEC);
int f;
if(access(fname, W_OK)!=0) // no
create_dir_for_file(file_spec);
if((f=open(fname,
O_CREAT|O_RDWR
|(as_text?_O_TEXT:_O_BINARY)
|(do_append?O_APPEND:PA_O_TRUNC), 0664))>=0) {
if((do_block?pa_lock_exclusive_blocking(f):pa_lock_exclusive_nonblocking(f))!=0) {
Exception e("file.lock",
&file_spec,
"shared lock failed: %s (%d), actual filename '%s'",
strerror(errno), errno, fname);
close(f);
if(fail_on_lock_problem)
throw e;
return false;
}
try {
action(f, context);
} catch(...) {
#ifdef HAVE_FTRUNCATE
if(!do_append)
ftruncate(f, lseek(f, 0, SEEK_CUR)); // one can not use O_TRUNC, read lower
#endif
pa_unlock(f);close(f);
rethrow;
}
#ifdef HAVE_FTRUNCATE
if(!do_append)
ftruncate(f, lseek(f, 0, SEEK_CUR)); // O_TRUNC truncates even exclusevely write-locked file [thanks to Igor Milyakov <virtan@rotabanner.com> for discovering]
#endif
pa_unlock(f);close(f);
return true;
} else
throw Exception(errno==EACCES?"file.access":0,
&file_spec,
"%s failed: %s (%d), actual filename '%s'",
action_name, strerror(errno), errno, fname);
// here should be nothing, see rethrow above
}
#ifndef DOXYGEN
struct File_write_action_info {
const char* str; size_t length;
};
#endif
static void file_write_action(int f, void *context) {
File_write_action_info& info=*static_cast<File_write_action_info *>(context);
if(info.length) {
int written=write(f, info.str, info.length);
if(written<0)
throw Exception(0,
0,
"write failed: %s (%d)", strerror(errno), errno);
}
}
void file_write(
const String& file_spec,
const char* data, size_t size,
bool as_text,
bool do_append) {
File_write_action_info info={data, size};
file_write_action_under_lock(
file_spec,
"write", file_write_action, &info,
as_text,
do_append);
}
// throws nothing! [this is required in file_move & file_delete]
static void rmdir(const String& file_spec, size_t pos_after) {
size_t pos_before;
if((pos_before=file_spec.pos('/', pos_after))!=STRING_NOT_FOUND)
rmdir(file_spec, pos_before+1);
rmdir(file_spec.mid(0, pos_after-1/* / */).cstr(String::L_FILE_SPEC));
}
bool file_delete(const String& file_spec, bool fail_on_problem) {
const char* fname=file_spec.cstr(String::L_FILE_SPEC);
if(unlink(fname)!=0)
if(fail_on_problem)
throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
&file_spec,
"unlink failed: %s (%d), actual filename '%s'",
strerror(errno), errno, fname);
else
return false;
rmdir(file_spec, 1);
return true;
}
void file_move(const String& old_spec, const String& new_spec) {
const char* old_spec_cstr=old_spec.cstr(String::L_FILE_SPEC);
const char* new_spec_cstr=new_spec.cstr(String::L_FILE_SPEC);
create_dir_for_file(new_spec);
if(rename(old_spec_cstr, new_spec_cstr)!=0)
throw Exception(errno==EACCES?"file.access":errno==ENOENT?"file.missing":0,
&old_spec,
"rename failed: %s (%d), actual filename '%s' to '%s'",
strerror(errno), errno, old_spec_cstr, new_spec_cstr);
rmdir(old_spec, 1);
}
bool entry_exists(const char* fname, struct stat *afinfo) {
struct stat lfinfo;
bool result=stat(fname, &lfinfo)==0;
if(afinfo)
*afinfo=lfinfo;
return result;
}
bool entry_exists(const String& file_spec) {
const char* fname=file_spec.cstr(String::L_FILE_SPEC);
return entry_exists(fname, 0);
}
static bool entry_readable(const String& file_spec, bool need_dir) {
char* fname=file_spec.cstrm(String::L_FILE_SPEC);
if(need_dir) {
size_t size=strlen(fname);
while(size) {
char c=fname[size-1];
if(c=='/' || c=='\\')
fname[--size]=0;
else
break;
}
}
struct stat finfo;
if(access(fname, R_OK)==0 && entry_exists(fname, &finfo)) {
bool is_dir=(finfo.st_mode&S_IFDIR) != 0;
return is_dir==need_dir;
}
return false;
}
bool file_readable(const String& file_spec) {
return entry_readable(file_spec, false);
}
bool dir_readable(const String& file_spec) {
return entry_readable(file_spec, true);
}
const String* file_readable(const String& path, const String& name) {
String& result=*new String(path);
result << "/";
result << name;
return file_readable(result)?&result:0;
}
bool file_executable(const String& file_spec) {
return access(file_spec.cstr(String::L_FILE_SPEC), X_OK)==0;
}
bool file_stat(const String& file_spec,
size_t& rsize,
time_t& ratime,
time_t& rmtime,
time_t& rctime,
bool fail_on_read_problem) {
const char* fname=file_spec.cstr(String::L_FILE_SPEC);
struct stat finfo;
if(stat(fname, &finfo)!=0)
if(fail_on_read_problem)
throw Exception("file.missing",
&file_spec,
"getting file size failed: %s (%d), real filename '%s'",
strerror(errno), errno, fname);
else
return false;
rsize=finfo.st_size;
ratime=finfo.st_atime;
rmtime=finfo.st_mtime;
rctime=finfo.st_ctime;
return true;
}
char* getrow(char* *row_ref, char delim) {
char* result=*row_ref;
if(result) {
*row_ref=strchr(result, delim);
if(*row_ref)
*((*row_ref)++)=0;
else if(!*result)
return 0;
}
return result;
}
char* lsplit(char* string, char delim) {
if(string) {
char* v=strchr(string, delim);
if(v) {
*v=0;
return v+1;
}
}
return 0;
}
char* lsplit(char* *string_ref, char delim) {
char* result=*string_ref;
char* next=lsplit(*string_ref, delim);
*string_ref=next;
return result;
}
char* rsplit(char* string, char delim) {
if(string) {
char* v=strrchr(string, delim);
if(v) {
*v=0;
return v+1;
}
}
return NULL;
}
/// @todo less stupid type detection
const char* format(double value, char* fmt) {
char local_buf[MAX_NUMBER];
size_t size;
if(fmt)
if(strpbrk(fmt, "diouxX"))
if(strpbrk(fmt, "ouxX"))
size=snprintf(local_buf, sizeof(local_buf), fmt, (uint)value);
else
size=snprintf(local_buf, sizeof(local_buf), fmt, (int)value);
else
size=snprintf(local_buf, sizeof(local_buf), fmt, value);
else
size=snprintf(local_buf, sizeof(local_buf), "%d", (int)value);
return pa_strdup(local_buf, size);
}
size_t stdout_write(const void *buf, size_t size) {
#ifdef WIN32
do{
int chunk_written=fwrite(buf, 1, min((size_t)8*0x400, size), stdout);
if(chunk_written<=0)
break;
size-=chunk_written;
buf=((const char*)buf)+chunk_written;
} while(size>0);
return size;
#else
return fwrite(buf, 1, size, stdout);
#endif
}
char* unescape_chars(const char* cp, int len) {
char* s=new(PointerFreeGC) char[len + 1];
enum EscapeState {
EscapeRest,
EscapeFirst,
EscapeSecond
} escapeState=EscapeRest;
int escapedValue=0;
int srcPos=0;
int dstPos=0;
while(srcPos < len) {
int ch=cp[srcPos];
switch(escapeState) {
case EscapeRest:
if(ch=='%') {
escapeState=EscapeFirst;
} else if(ch=='+') {
s[dstPos++]=' ';
} else {
s[dstPos++]=ch;
}
break;
case EscapeFirst:
escapedValue=hex_value[ch] << 4;
escapeState=EscapeSecond;
break;
case EscapeSecond:
escapedValue +=hex_value[ch];
s[dstPos++]=escapedValue;
escapeState=EscapeRest;
break;
}
srcPos++;
}
s[dstPos]=0;
return s;
}
#ifdef WIN32
void back_slashes_to_slashes(char* s) {
if(s)
for(; *s; s++)
if(*s=='\\')
*s='/';
}
/*
void slashes_to_back_slashes(char* s) {
if(s)
for(; *s; s++)
if(*s=='/')
*s='\\';
}
*/
#endif
bool StrEqNc(const char* s1, const char* s2, bool strict) {
while(true) {
if(!(*s1)) {
if(!(*s2))
return true;
else
return !strict;
} else if(!(*s2))
return !strict;
if(isalpha(*s1)) {
if(tolower(*s1) !=tolower(*s2))
return false;
} else if((*s1) !=(*s2))
return false;
s1++;
s2++;
}
}
static bool isLeap(int year) {
return !(
(year % 4) || ((year % 400) && !(year % 100))
);
}
int getMonthDays(int year, int month) {
int monthDays[]={
31,
isLeap(year) ? 29 : 28,
31,
30,
31,
30,
31,
31,
30,
31,
30,
31
};
return monthDays[month];
}
void remove_crlf(char* start, char* end) {
for(char* p=start; p<end; p++)
switch(*p) {
case '\n': *p='|'; break;
case '\r': *p=' '; break;
}
}
/// must be last in this file
#undef vsnprintf
int __vsnprintf(char* b, size_t s, const char* f, va_list l) {
if(!s)
return 0;
int r;
// note: on win32& maybe somewhere else
// vsnprintf do not writes terminating 0 in 'buffer full' case, reducing
--s;
#if _MSC_VER
/*
win32:
mk:@MSITStore:C:\Program%20Files\Microsoft%20Visual%20Studio\MSDN\2001APR\1033\vccore.chm::/html/_crt__vsnprintf.2c_._vsnwprintf.htm
if the number of bytes to write exceeds buffer, then count bytes are written and Ö1 is returned
*/
r=_vsnprintf(b, s, f, l);
if(r<0)
r=s;
#else
r=vsnprintf(b, s, f, l);
/*
solaris:
man vsnprintf
The snprintf() function returns the number of characters
formatted, that is, the number of characters that would have
been written to the buffer if it were large enough. If the
value of n is 0 on a call to snprintf(), an unspecified
value less than 1 is returned.
*/
if(r<0)
r=0;
else if(r>s)
r=s;
#endif
b[r]=0;
return r;
}
int __snprintf(char* b, size_t s, const char* f, ...) {
va_list l;
va_start(l, f);
int r=__vsnprintf(b, s, f, l);
va_end(l);
return r;
}
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